Event History Payload Display Issue

One of our projects has suddenly started displaying our custom playload data incorrrectly. It appears to be displaying all our custom data with an underscore as nested json objects.

Should be:
{other data ...

"project_name" : "Cardio",
other data ...
}

Displaying as:
{other data ...

"project" : { "Name" : "Cardio"}},
other data ...
}

We are piping this data to Snowflake and the data appears sound, but we want to understand what's wrong here. {

    "EventName": "case_start",
    "EventNamespace": "title.A5A0",
    "EntityType": "player",
    "EntityId": "ENTITY_ID",
    "EventId": "48a705bb879e42dbb16a3803c6562f0a",
    "SourceType": "GameClient",
    "PlayFabEnvironment": {
        "Vertical": "master",
        "Cloud": "main",
        "Application": "mainserver",
        "Commit": "a6d7287"
    },
    "Timestamp": "2019-04-09T21:30:52.5291189Z",
    "Source": "TITLE_ID",
    "TitleId": "TITLE_ID",
    "session": {
        "id": "b8ef19e4ae5469040639e449f3cf0db0"
    },
    "project": {
        "name": "Cardio"
    },
    "build": {
        "version": "0.0.2.142"
    },
    "cl": {
        "number": "12534"
    },
    "os": {
        "name": "IOS",
        "version": "iOS 12.1.4"
    },
    "device": {
        "name": "iPhone11,8"
    },
    "client": {
        "event": {
            "guid": "facc6ec9-a518-4eea-8781-9b01fdeac6cf"
        },
        "timestamp": "2019-04-09T23:30:52.4047980Z"
    },
    "case": {
        "id": "SambaDeStenosis",
        "guid": "644766e1-eb8a-426f-bd6c-2a967b5e235d",
        "name": "Samba de Stenosis"
    }
}